Apparatus for perforating bands of cellulose foil, metal foil, and the like



I Jan; 10, 1939. 2,143,209

A. RAMBOLD APPARATUS FOR PERFOHATINGBANDS OP'` CELLULOSE "E FOIL, METAL FUIL, AND THE LIKE Qriginal Filed Aug; 8; 1955 l I Il n nl u fm u n u Tron/vf wwf@ Pstsntsd iss. 1o, i939" rlginal 35,390.

application January 14,

This invention relates to apparatus for perforating bands of cellulose foil, metal foil andthe like, and is a division of my application-for Method of and apparatus for producing perforations of small diameter in bands of cellulose foil, metal foil and the like, 4filed August 8, 1935, and bearing the Serial Number 35,390.

' The problem of perforating bands of cellulose foil, metal foil or the like by means of machinery has not/yet been satisfactorily solved. For example, the attempt to employ a roller fitted with steel pins as a perforating tool has proved iinsuitable on account of the costs and also the technical difficulties. The wear of the pins is excessive as maybe appreciated from the fact that in the case of a roller about 150 mm. wide 60 pins disposed in one row' all act atonce and the- 'total power flux nis distributed upon a very small area. This produces too great a strain on the Il band of material itself and the perforation is not satisfactory and uniform, particularly in the -case of small perforations of from 1/2mm. diameter downwards. There is also considerable waste ofl timefsince the loss ofone pin is` sufci'ent to put 5,- the tool out of action.

A perforating machine' is known (U. S. Patent No. 1,967,2 02 to Dalton) with means for feeding and unwinding a strip of material and having a perforating punch operated by an eccentric and l actuating wheels provided with a plurality of `perforating needles, the wheels operating simultaneously and on Speed of the punch motion being greater than that of the work motion. This machine, however, 35 discloses considerable inconveniences as compared to' that 'of the present application, inasmuchas themass moved is 'much greater, even" though it is attempted to balance the mass forces by counterweights. Furthermore, the stress' to 4o which thematerial-is subjected in the c oiirseoi the perforationis too considerable, and, which is no lessy important, this machine 'cannot form a perfect perforation, which the machine as disclosed in the appliationsafely forms, owing to 4fV its bevel ground cutting tools. .The machine, ac-

`gcording to the present-application, is capable of much faster operation, just asV a. steam turbine i rotates much faster than the fly-wheel of a piston steam-engine. A' t 50 y The results obtained with stamping tools have also proved unsatisfactory, since in practice these permit of onlysmall `feed movements?. These tools were, furthermore, much too weak anddeli cate for such small holes and therefore too sensi- In Germany September 17,

u cnam. (ci. isi-99)' According to the invention,

a comparatively small area, the t l intattinon musulmana-Leutnant, Germany application August 8, Patent No. 2,101,753.

1935, Serial No. Divided andthis 1937, Serial N0. 120,588.

'UNIT-'ED STATES PA-TENT -oFFica-j `.lis distinct from these previous attempts, thev present invention makes it possible 'to eect the required perforation satisfactorily in a very shorttime and at little cost;

a plurality of perforating wheels, relatively displaced in stepped formation. (in ployed for effecting the perforation, so that the tools are distributed over Furthermore. it is of importancethat the cutting edges of the individual cutting tools are ground back.

An embodiment of apparatus in accordance with the invention is illustrated diagrammatically in the accompanying drawing by way of example.

. Fig. 1 is a side elevation of the apparatus.

the form of a staircase) are ernthe longest possible `stretch of the band for a given hole spacing.

Fig. 2 is a fragmentary plan view, partly in sec'- tion, corresponding toFig. 1.

Fig. 3 shows part of a cam means described. Fig. 4 shows the disposition of the' perforatig hereinafter tools onone of the tool holders, their clamping disc being omitted.

Fig. 5 illustrates a known form of cutting tool.

cutting-tool in side eleva Fig. 6 shows a n'ovel tin. f t

' Fig. 7 is a front view ofthe new cutting tool. Fig. 3 shows a perforation as made with the known tool.

Fig. 9 shows a perforation new tool.

In the drawing, I indicates a cylinder which h as a sleeve or covering 2 of hard rubber or the is areel of cellulose foil to be perforated,

as made with the like.r 3

I- a tensioning rollerfor the band 8V of the cellu *I lose material, 5 a pair of pull-rollers,l and' 6 a take-up roller for the perforated material.44 The take-up roller is rotatably carried by arms plvotally mounted at 1.

The band of material 8 passes over the cylinder l which ls'flxed on its' shaft 26. Grouped about the cylinder i are cesslvely offset in stepped formation across the cylinder and thereby, as shown in Fig. tributed with a" certain space in theV direction of the width 4(as at a) and in axial direction (as at b) The tool holders are distributed over as great a width of the work as possible. within theV limits of the width of the drinn l and in radial `as well as. axial direction, which may be done by changing the space b, the punches being shiftably arranged.4 Each holder 9 is constituted by a bush whichiis keyed or clamped on a shaft Il disposed 2, dis- -holder shaft I0 can be rocked to move the perforating tools carried by the holder 9 towards or away from the cylinder I. A spring I6 fixed to the frame I3 and to the guide II tends to press the holder 9 to the cylinder.' The penetration depth of the punches into the work may be regulated by means of a set-screw I1 shiftable with regard to a stop I8 of the guide member' I4.

lThe lateral axial spacing of the individual tool holders may be varied by interposing rings (not shown).

As shown in Fig. 4, each bush-shaped holder 9 presents a ring surface I9 having radial grooves in which the perforating tools 20 are fitted. The tools 20 are centered by a screw bolt 2| (Fig. 2)' and are rmly clamped to the holder by a disc 22 engagedby a nut 23 threaded on the bolt 2l, to iioorm a perforating wheel rotatable with the shaft The other end of each shaft I0 carries a pinion 24 which meshes with a gear 25 secured to the ,Y shaft 26 of the cylinder I. Loosely mounted by the side of the pinion 24 on each shaft Ill) is a cam roller 21 which engages a cam,

disc 28 (Fig. 3). Preferably this cam disc -is disposed in the gear casing 29 which is fitted with a handle 30.

As already mentioned, the cutting tools .in each holder 9 are radially disposed and form a perforating wheel, which rotates around its axis, that is about the axis of its shaft, no relative motion taking place between the perforating wheel and the work to be perforated by motion of the latter and simultaneous rotation of the pcrforating wheel about .its axis. Y

If a cutting tool 3l (Fig. 5) of circular section 'having a cutting edge 33 plane ground at right angles to its longitudinal axis were used, satisfactory perforation would not be obtained'with the apparatus described, because of the manner in which the tool is applied to the work. Manifestly, at the beginning of the cutting or. perforating action, the t'ool is applied to the work 34 in such a way that it increasingly penetrates into the work, but at the end lt is again lifted off;

consequently, a cutting tool with a cutting edge as statedl is unable to produce a clean and complete cut. Usually the cut away piece 36 (Figs. 5 and 6) forming the perforation 35 remains hanging on the work.-

For this reason;i and in accordance witlrthe" invention, the cutting edge of each tool 20 (Figs. 6 and 7) is ground back. whereby it becomes posT sible to produce a satisfactory cut; moreover, the tool is recessed, as by grinding, transversely to the cutting direction so that the cutting edge 32 isobtained. The punches 20 are ground to a bevel transversely to the cutting direction in such a manner that thethus formed points of the cutting needles are arranged in a plane vertical with regard to the axis of the rollers. With such tools, perfect perforation as denoted by 31 in Fig. 9 is attained. V A

The operation ofthe apparatus is as follows The band of material 8 is pulled off the reel 3 over the tensioning roller 4 andthe cylinder I by the pull rollers 5 and wound upon the take-up roller 6. In its passage over the cylinder I the band 8 is engaged by tools carried by the holders 9 and is perforated. The tool holders, as has been mentioned above, arev "positively rotated. The depth of penetration of the tools .into the band of material may be accurately adjusted with the aid of the adjusting screw I1 in cooperation with the spring I6.- In order that all tool holders may be thrown out of action at once, the engagement and disengagement device comprising the cam rollers 21 and the cam disc 28 is provided. For its operation it is only necessary to displace the lever 30 slightly so as to bring the crests ofthe cam disc into engagement with the rollers 21;thje two openings coordinated toV a roller 21 have a diierent distance from the center of the cam roller.,

In order that the band of materiali! may always be guided in a tensioned conditionover the cylinder I, the pair of rollers 5 is positively\driven at a speed of rotation which is slightly greater than that of the cylinder I.

I claim:

1. InV apparatus for producing small perforations in bands of thin cellulose, metal foil and the like, a frame, a band supporting cylinder journaled in said frame and having an elastic surface to Aprovide a resilient backing for said bands, rotatable tool holders spaced side by side around a segment of said cylinder with their aXes parallel to the axis of the cylinder, a rotary punching wheel supported by each tool holder, said wheels being oiset from each other longi- -tudinally of the cylinder, and means operatively connecting the wheels and cylinder to rotate them in unison.`

' 2. In apparatus for producing small perforat-ions in bands of thin cellulose, metal foil and the like, a frame, a band supporting cylinder journaled in said frame and having a yieldable surface, rotatabletool holders spaced side by side around a segment of said cylinder with their axes parallel to the axis of the cylinder, a rotary punching wheel supported by each tool holder, said wheels being oiset from each other longitudinally of the cylinder, and means operatively connecting the wheels and cylinder to rotate them in unison, said punching wheels each having a series of peripherally disposed cutters hollow ground transversely to the cutting direction. 3. In apparatus for producing small perforations in bands of thin cellulose, metal foil and the like, a frame, a band supporting cylinder journaled in said frame and having an elastic surface to provide a resilient backing for said bands, rotatable tool holders spaced side by side around'a segment of said. cylinder with their axes parallel to the axis of the cylinder, arotary punching wheel supported by each tool holder, said wheels being oiset from each other longitudinally of the cylinder, guide means for said tool holders rockingly supported on said frame to move the wheels towardand from the cylinder, means to adjust the positions of said guide means independently, and means operatively ,connecting the wheels and cylinder to rotate them in unison.

4. In apparatus for producing small perforations in bands of thin cellulose, metal foil and the like, a frame, a band supporting cylinder journaled in said frame and having a yieldable surface, rotatable tool holders spaced side by sideV around a segment ofnsaid cylinder with their axes parallel to the axis of the cylinder, a rotary punching wheel supported by each tool holder, said wheels being oset from each otherlongitudinally of the cylinder, guide means lfor said tool holders rocklngly supported on said frame ynaanoo to move the wheels toward and from the cylinder, means to adjust the positions of said guide means independently, and means operatively connecting the wheels and cylinder to rotate them in unison, said punching wheels each having a series of peripherally disposed cutters hollow ground transversely to the cutting direction.

5. In apparatus for/producing small perforations in bands 'of thin cellulose, metal foil and the like, a frame, a band supporting cylinder journaled in said frame and having a yieldable surface, rotatable tool holders spaced side by side around alsegment of said cylinder with their axes-,f

parallel to the axis oi the cylinder, a rotary punchingwheel supported by each tool holder, said wheels being `offset fromeach other longitudinally of the cylinder. guide means for said `tool holders rockingly supported on said frame to move the wheels toward and from the cylinder, an abutment iixed on said frame in the paths of said guide means, an adjusting screw carried by each guide means to engage 'said abutment and limit movement of the wheel to-y ward said cylinder, springs urging said screws into engagement 'with said abutment, and means operatively connecting the wheels and cylinder to rotate them in unison.

6. 1n apparatus for producing small periora tions in bands of thin cellulose, metal foil and the like, a frame, a band supporting cylinder journaled in said frame and having a yieldable surface, rotatable tool holders spaced side by side ,an abutment fixed around a segment of4 said cylinder with their axes parallel to the axis of the cylinder, a rotary l punching wheel supported by each tool holder, said wheels being oiset from each other longitudinally of the cylinder, guide means for said tool holders rockingly supported on said frame to move the wheels toward and from the cylinder, on said frame 'in the paths of said guide means, an adjusting screw carried by each guide meansto engage said abutment and limit movement of the wheeltoward said cylinder, springs urging said screws into engagement with said abutment, and means operatively connecting the wheels and cylinderY to ro,- tate them in unison, saidpunchingtwheels each having a series of peripherally disposed cutters hollow ground transversely tothe cutting direction. l

7. In apparatus for producing small perforations in bands of thin cellulose, metal foil and the like, a frame, a band supporting cylinder journaled in said frame and having an elastic surface 55 to provide a resilient backing for said bands, ro-

70 iournaled in said frame tatable tool holders spaced side by side around a `segment of said cylinder with their axes parallel to the axis or the cylinder, a rotary punching wheel supported by each tool holder, said wheels being ofisetirom each other longitudinally of the cylinder, each ot said wheels comprising a radially grooved bushing having cutting tools mounted in said grooves and a clamping disc coacting with the bush to hold the cutters in place, and means operatively connecting the wheels and cylinder to rotate them in unison.

8. In apparatus for producing small perforations in bands of thin cellulose, metal foil and the like, a frame, a band supporting cylinder and having ayieldable surface, rotatable, tool holders spaced side by side around a segment ot said cylinder with their axes parallel to the axisot the cylinder.. a ro tary punching wheel supported by each tool holder, said wheels being odset from each other longitudinally of the cylinder, each of said wheels comprising a radially grooved bushing having cutting tools mounted in said grooves and a clamping disc coactlng with the bush to hold the cutters in place, said cutting tools being transversely hollow ground, and means operatively connecting the wheels and cylinder to rotate them in unison.

9. In apparatus for producing small perforations in bands of thin cellulose, metal foil and the like, a trame, a band supporting cylinder iournaled in said frame and having a yieldable surface, rotatable tool holders spaced side by side around a segment of said cylinder with their axes parallel to the axis of the cylinder, a rotary punching wheel supported by each tool holder, said wheels being onset from each other longitudinally of the cylinder, guide means for said tool holders rockingly supported on said frame to move the wheels toward and from the cylinder, means to adjust the positions of said guide means independently, means operatively connecting the wheels and cylinder to rotate them in unison, and means rocklngly supported by said frame and engaging said guide means to rock all said guide means simultaneously toward and from the cylinder.

10. In apparatus for producing small 'perforations inA bands of thin cellulose, metal foil and the like, a frame, a band supporting cylinder journaled in said frame and having a yieldable surface, rotatable tool holders spaced side by side around a segment of said cylinder with their axes parallel to the axis of the cylinder, a rotary punching wheel supported by each tool holder. said wheels being oiIset from each other longitudinally of the cylinder, guide means for said tool holders rockingly supported on said frame to move the wheels toward and from the cylinder,

an abutment ilxedV on said frame in the paths o! an adjusting screw carried by to engage` said abutment and the wheel toward said cylinder, springs urging said screws into engagement with said abutment. means operatively connecting the wheels and cylinder te rotate them in unison, and means rockingly supported by said frame and engaging said guide means to rock all said guide means simultaneously toward and from the cylinder.

1l. In apparatus for producing small perforations in bands ot thin cellulose, metal foil and the like, a liframe, a band supporting cylinder iournaled in said frame and having an elastic surface to provide a resilient backing for said bands, rotatable tool holders spaced side by side around a segment of said cylinder with their axes parallel to the axis of the cylinder, a rotary punching' wheel supported by each tool holder, and means operatively connecting the wheels and cylinder to rotate in unison, said punching wheels each having a series of peripherally disposed cutters hollow ground transversely to the cutting direction.

said guide means, each guide means limit movement of Anouinounou. 

